What would you put this in?

There’s a BMW K100 on craigslist near me “for parts”. It’s got a longitudinally mounted 1000 cc inline 4 that’s layed over on it’s side. It also has an integrated 5 speed gearbox with a driveshaft back to the rear diff mounted in the swingarm.

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I’ve always thought this would an interesting engine for a small bike engine’d car project, but can’t decide what I’d put it in. Thoughts?